Giúp mình câu 44, 45 với ạ
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44 If I had known your name, I could have introduced you with my friends
45 If the driver in front hadn't stopped so quickly, the accident wouldn't have happened
46 If I had known Geogre wanted to get up early, I would have waken him
47 If Jim hadn't lent me the money, I wouldn't have been able to buy the motorbike
48 If she hadn't been wearing the seat belt, she wouldn't have injured (câu này sao ta)
49 If she had had enough money on her, she would have bought the coat
50 If....(tên ai đó) hadn't gone to the bus stop in time, she would have late for the interview
51 If.......hadn't recommened the hotel to us, we wouldn't have stayed at this hotel
52 If you had had breakfast, you wouldn't be hungry now
\(\overrightarrow{u}=4\overrightarrow{MA}-3\left(\overrightarrow{MA}+\overrightarrow{AB}\right)+\overrightarrow{MA}+\overrightarrow{AC}-2\left(\overrightarrow{MA}+\overrightarrow{AD}\right)\)
\(=-3\overrightarrow{AB}+\overrightarrow{AC}-2\overrightarrow{AD}=-3\left(\overrightarrow{AB}+\overrightarrow{AD}\right)+\overrightarrow{AC}+\overrightarrow{AD}\)
\(=-3\overrightarrow{AC}+\overrightarrow{AC}+\overrightarrow{AD}=-2\overrightarrow{AC}+\overrightarrow{AD}\)
\(\overrightarrow{u}^2=\left(-2\overrightarrow{AC}+\overrightarrow{AD}\right)^2=4AC^2-4\overrightarrow{AC}.\overrightarrow{AD}+AD^2\)
\(=4\left(a\sqrt{2}\right)^2-4.a\sqrt{2}.a.cos45^0+a^2=5a^2\)
\(\Rightarrow\left|\overrightarrow{u}\right|=a\sqrt{5}\)
41. Roger: " I don't believe it. " - Anita: " ..................... "
→ Đáp án: C. Neither do I
42. Jill : " Do you know Lisa's an excellent pianist ? - Maria: " ..................... "
→ Đáp án: B. Yes, she does
43. Karen: " ............... this word in English ? " - Betsy: " C-O-Z-Y "
→ Đáp án: B. How do you spell
44. Customer: " I think my change is wrong. " - Shop assistant: " ................... "
→ Đáp án: C. Sorry. I don't think I have any change
45. Mandy: " I've got a toothache. " - George: " ................. "
→ Đáp án: D. Why don't you see the dentist ?
Câu 42:
Δ1: VTPT là (m;-1)
Δ2: VTPT là (2;-1)
Để Δ1 vuông góc Δ2 thì m*2+(-1)*(-1)=0
=>2m+1=0
=>m=-1/2
Bài 44:
a, 1,2 : 3,24 = \(\frac{1,2}{3,24}=\frac{120}{324}=\frac{10}{27}\)
b, \(2\frac{1}{5}:\frac{3}{4}=3\frac{41}{45}=\frac{176}{45}\)
c,\(\frac{2}{7}:0,42=\frac{\frac{2}{7}}{0,42}=\frac{2}{7}.\frac{100}{42}=\frac{100}{147}\)
vào đây nè:Chuyên trang lý thuyết tổng hợp các môn THPT bài nào cũng có
44 + 45 + 46 + 47 + 48 + 49 + 50 + 51
= \(\left[\left(51-44\right):1+1\right].\left(\frac{51+44}{2}\right)\)
= \(8.\frac{95}{2}\)
= \(380\)
Vậy 44 + 45 + 46 + 47 + 48 + 49 + 50 + 51 = 380
giúp mình đi mà!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
\(7x-2x=6^{20}:36^9+44:11\)
\(=>x\left(7-2\right)=6^{20}:6^{18}+4\)
\(=>x5=6^2+4=36+4=40\)
\(=>x=40:5\)
\(=>x=8\)
bạn hay xem video bài giảng trong link này nha
https://www.youtube.com/watch?v=wBWTiEHKnqM
Câu 44: C
Câu 45: C